/*
 *  Copyright 2009-2016 Weibo, Inc.
 *
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */

package com.weibo.api.motan.util;

import java.util.Collection;
import java.util.Map;
import java.util.Random;

/**
 * Utils for collections.
 *
 * @author fishermen
 * @version V1.0 created at: 2013-6-7
 */

public class CollectionUtil {

    @SuppressWarnings("rawtypes")
    public static boolean isEmpty(Collection collection) {
        return collection == null || collection.isEmpty();
    }

    @SuppressWarnings("rawtypes")
    public static boolean isEmpty(Map map) {
        return map == null || map.isEmpty();
    }

    public static void shuffleByteArray(byte[] array) {
        Random rnd = new Random();
        for (int i = array.length - 1; i > 0; i--) {
            int index = rnd.nextInt(i + 1);
            // swap
            byte b = array[index];
            array[index] = array[i];
            array[i] = b;
        }
    }

}
